Highest temperature in Seoul on July 1?

Platform comparison

Market context

Seoul is set to face its peak summer heat on 1 July 2026, with the Incheon International Airport station expected to record temperatures that could challenge recent early-July extremes. The market currently prices the "YES" outcome at 0%, implying traders believe the temperature will not reach the specific threshold required for settlement, despite historical data showing July as Seoul’s hottest month, with average highs around 27°C and occasional spikes exceeding 37°C[1][3].

Historical precedents frame this probability starkly: Seoul recorded 37.8°C on 8 July 2023, the highest early-July temperature in 117 years of records, while the city’s all-time heat peak of 39.6°C occurred on 1 August 1994[4][6]. These cases suggest that while extreme heat is plausible in early July, the 0% pricing may reflect a narrow threshold that recent records have not yet breached, or a market consensus that 1 July specifically will not match the volatility of later dates[9].

Traders should monitor the Korea Meteorological Administration’s daily heatwave forecasts and any sudden shifts in monsoon patterns, as these directly influence temperature spikes. Recent news from Anadolu Ajansı confirms that South Korea has already recorded its highest-ever July temperatures in 2023, setting a benchmark for 2026 expectations[9]. On-chain, the contract settles via USDC on Polygon using conditional tokens, with the final resolution dependent solely on Wunderground’s verified data for the Incheon station[4]. No moralising is needed; the facts dictate that heat is likely, but the threshold remains the critical variable.

Sources: 1 · 2 · 3 · 4 · 5

Methodology

We track Highest temperature in Seoul on July 1? across the five venues with material prediction-market liquidity. The probability shown is the live Polymarket mid; the comparison rows summarise how each venue treats the underlying contract — fees, KYC thresholds, settlement currency, deposit options. The highlighted row marks the cheapest route into Polymarket's order book.

Resolution & payout

Polymarket-based markets settle through the UMA Optimistic Oracle on Polygon. A proposer submits the outcome, a two-hour challenge window opens, and unchallenged proposals finalise the resolution. Payouts settle automatically in USDC the moment the result is final — no bookmaker, no delay.

Kalshi-based markets settle in USD via the CFTC-regulated clearinghouse. Betfair Exchange settles in GBP/EUR net of commission. Manifold is play-money and does not pay out real funds.

FAQ

Where can I trade this market with the lowest fees?

Polymarket is geo-blocked in the US/UK/EU. The easiest 0%-fee broker into the same order book is Polymarket Legit?. Kalshi charges up to 7% per trade; Betfair Exchange takes 2-5% commission on net winnings.

How does resolution work?

Through the UMA Optimistic Oracle on Polygon: a proposer submits the outcome, a two-hour challenge window opens, and USDC payouts settle automatically once the result is final.

What does Polymarket cost to trade?

Polymarket itself charges 0% — the only cost is the Polygon network fee, typically under $0.01 per transaction. Off-chain venues like Kalshi or Betfair charge 2-7% commission.

How fast are USDC deposits?

Polygon credits deposits after 12 confirmations — usually under 30 seconds. Withdrawals follow the same path and land back in your wallet within minutes.

Do I need to KYC for this market?

On Polymarket directly, no — it's wallet-based. Intermediary brokers like Polymarket Legit? trigger KYC only above $1,500 of lifetime trading volume; under that you trade pseudonymously with a single wallet address.